The act of ranting about your opinion, but at the same time knowing nobody cares. Mostly used in tags and not as an actual noun.
(insert hate towards band here) #unpopular opinion
by warawarawara March 20, 2011
An opinion disputed by the media as well as most of the "popular" population.
An example for unpopular opinion: #TweetYourUnpopularOpinion blonde girls aren't even hot at all
by kevin J February 01, 2014